Support multiple 'link' headers

[mfncooper]

The HTTP 'link' header may legally appear multiple times in a request, but Node will drop all but the first one.

The trivial fix is to add 'link' to the case statement here:

https://github.com/joyent/node/blob/master/lib/http.js#L287

[isaacs]

+1. You'll almost always have more than one, in fact. Wanna sign the cla (if you haven't) and try a patch? (If you don't feel like it, I or someone else can, I'm sure.)

[mfncooper]

Sure. My CLA should be on file already. I posted the patch here:

http://groups.google.com/group/nodejs-dev/msg/2afa0dfc02831a36

[ry]

thanks